Describes operation and equipment. There are 600 incoming circuits, terminating on 60 control positions. Power is supplied by two Crompton motor generators of 13 hp. (See also Electrician, vol. 87, no. 2266, Oct. 21, 1921, pp. 510-514, 7 figs)
The London toll exchange
P. O. Elec. Engrs. Jl
Post Office Electrical Engineers Journal ; 14 , Part 3
1921
10 pages
12 Figs.
Article (Journal)
English
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